Casing-tongs.



No. 879,809. PATENTED FEB. 18, 1908.

J. w. BRAGKNEY.

GASING ToNGs.

APPLICATION FILED AUG.12, 1907.

2 SHEETS-SHEET l.

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J. W. BRAGKNEY.

No. 879,809. PATBNTBD FEB. 18, 1908.

GASING TONGS.

APPLICATION FILED AUG. 12, 1907.

2 SHEETS-SHEET 2.

JOHN W. BRACKNEY, OF FULLERTON, CALIFORNIA.

CASING-TON GS.

Speccation of Letters Patent.

Patented Feb. 18, 1908.

Application filed August 12.1907. Serial No. 388|l36.

To all whom it may concern:

Be it known that I, JOHN W. BRACKNEY, a citizen of the United States, residing at Fullerton, county of Orange, State of Oalifornia, have invented new and useful Improvements in Casing-TongsI of which the following is a specification.

My invention relates to a casing tongs which is adapted to be operated by power from a drilling rig and the prime object thereof is to provide a simple and efficient device which may be readily placed upon the casing and which will quickly and uniformly screw the oints of the casing together.

A further object is to provide a tongs of compact dimensions which may be easily handled in a derrick.

I accomplish these objects by means of the device described herein and illustrated in the accompanying drawing in which:-

Figure 1,* is a plan view of my improved casing tongs. Fig. 2,- is a side elevation of the same. Fig. 3,- is a section taken on line 343 of Fig. 1. Fig. 4,- is a detailed perspective view of one of the operating arms7 parts being broken away to show the dog therein` Fig. 5, is an elevation of a portion of a drilling rig showing the application of my improved tongs. Fig. 6,- is a perspective view of the removable portion of the rim.

In the drawings 6 designates a circular ring preferably constructed of cast iron with ratchet teeth 7 on both its faces. Rim 6 is grooved as at 8 on its inner and outer peripheries for the purpose of retaining operating arms 9 and 10 on the upper and lower faces of the rim. The construction of operating arms 9 and 10 is shown more particularly in Fig. 4. A plate 11 is adapted to fit over ratchet teeth 7 and is provided with grooved lugs 12 on its under face adapted to fit into grooves 3 in rim 6 and thereby to hold the operating arms in engagement with the rim. A dog 13 is pivotally mounted in boss 14 on plate 11 and is forced by coiled spring 15 into engagement with ratchet teeth 7 thereby preventing the movement of operating arms 9 and 10 on rim 6 in one direction and at the same time permitting the arms to move freely in the other direction on the rim.

Rim 6 is provided with an internal frame 2() cast integrally therewith and which provides guideways for casing jaws 21 and 22 mounted thereon. Jaw 21 is rigidly but removably mounted in frame 20 by means of plate 23 secured by bolts 24 to plate 20 and secured by a bolt 25 to jaw 21. Jaw 21 is provided with a plurality of holes 26 for the reception of bolt 25 so that the jaw may be adjusted to different sized casings. Lugs 27 are provided on jaw 21 to keep the same in a vertically central position and make the whole construction as rigid as possible. Plate 23 is further permanently secured to a plate 28 which is cast integrally with a removable portion 29 of rim 6. y By removing bolts 24 plate 23 together with jaw 21 and rim portion 29 may be removed from frame 20 thus allowing the rim to be placed around a joint of casing when the jaw may be placed again in position.

From Fig. 6 it will be particularly noted that while the main part of the cut at the ends of the portion 29 are angular, a small portion in the center is cut straight through making a tongue and groove joint between the two parts as shown in Fig 1. This construction holds the removable portion from any lateral movement.

Jaw 22 is adapted to slide between two guide plates 30 rigidly secured to frame 20 being movable by means of screw 31 provided on its outer end with a wrench square 32 so that it may be turned to move jaw 22 into engagement with casing 33. Screw 31 passes through frame 20 and is provided with two shoulders 34 on either side of the frame which prevent the screw from longitudinal movement therein.

The mode of operation of my tongs is illustrated in Fig. 5 in which a drilling rig 35 of usual construction is shown. The tongs having been placed upon the casing, cables 36, 37 and 38 are rigged up in the manner illustrated, cable 36 connecting operating arm with crank 39 on the band wheel shaft, cable 37 passing over a fixed pulley 40 and thence forwardly to operating arm 10, cable 3S passing from operating arm 10 over fixed pulley 41 to operating arm 9. The jaws being screwed down tightly to casing 33 band wheel 42 is rotated by the engine (not shown) and operating arms 9 and .10 are reciprocated back and forth upon rim 6 thereby constantly moving rim 6 in the direction shown by the arrows. It will be observed'that one of the operating arms is always moving in that direction so that the rotary motion of the casing is continuous.

My improved casing tongs will be seen from the above description to be simple in construction and operation, performing the work of screwing up joints of casing very evenly and efficiently.

A great advantage accrues from the utilization of a constant rotary motion of the casing as no undue strain is put upon the same as is inevitably the case when it is screwed up by hand or by an intermittent power motion.

Having described my invention what I claim as new and desire to secure by Letters Patent is l. In a casing tongs, a rim provided with ratchet teeth on both ol its faces, casing gripping means mounted within said rim, an operating arm mounted on each face of the rim and adapted to slide thereon, spring pressed dogs in said operating arms adapted to engage with the ratchet teeth on said rim, and means to alternately oscillate said operating arms.

2. ln a casing tongs, a rim7 means to clamp said rim on the casing, a pair of operating arms adapted to rotate said rim, and` means to alternately oscillate said arms.

3. In a casing tongs, a rim provided with ratchet teeth thereon, means to clamp said rim on the casing, a pair of operating arms adapted to engage the ratchet teeth on said rim, and means to alternately oscillate said engage with the teeth on said rim, and means to alternately oscillate said arms.

5. In a casing tongs, a circular rim provided with a double set of ratchet teeth, and also provided with a removable section 'for placement around the casing, a frame rig- .i

idly mounted inside said rim, slidable casing gripping jaws mounted on said frame, a pair of operating arms slidably mounted on said rim, dogs in said arms adapted to engage with the teeth in said rim, and means to alternately oscillate said arms.

In witness that l claim the foregoing l have hereunto subscribed my name this 5th day of August, 1907.

JOHN WV. BRACKNEY.

Witnesses EDMUND A. STRAUSE, OLLIE PALMER. 

